Pressure casting machine



Cd. 9, 1945. U DT 2,386,271

PRESSURE CASTING MACHINE Filed April 29, 1943 INVENTOR ATTORNEY Patented Oct. 9, 1945 UNITED STATES PATENT OFFICE PRESSURE CASTING MACHINE John R. Schuchardt, Bayside, N. Y.

Application April 29, 1943, Serial No. 484,981

1 Claim.

The invention relates to an improved type of die carriage for pressure casting machines employing alloys of zinc, tin, lead or other fast solidifying materials which can be injected in their molten or plastic stage and solidify while in the die impression.

The method of injection is not relevant and the new and novel type of carriage has as its objective the speedy and automatic removal of the solidified object from the die or mold plus the automatic removal of the cast object from its suspended position on the ends of the ejector pins.

One application of the die carriage is illustrated in the accompanying drawing in which Figure 1 is a front View and partial vertical section of a casting machine in which the front half of the carriage has been removed to more clearly show the operation of the mechanism. Figure 2 is a plan view of the carriage end of the machine with the dies or molds in their closed or receiving position. Figure 3 is the same View as Figure 2 except the carriage is shown in its opened position after the material has solidified and the casting is at the point of being ejected from the mold and removed from the tips of the ejector pins. Figure 4 is a Vertical section of the carriage through the dies and illustrates further the method used in attaining the object of automatic ejection.

Making reference to Figure 1 which illustrates a, typical casting machine, the manual turning of the handle I operates the control mechanism 2 which allows air or oil under pressure to operate the cylinder 3 (to open and close the die carriage mechanism) and cylinder 4 to inject the substance to be cast (in its fluid form) into the die 5. This same sequence of operation may be attained by belt drive from a constant speed motor to pulley 6.

Referring to Figure 2, the plan view of the machine, the dies 5, 5 (which contain the impression of the part to be molded or cast) are held rigidly affixed to two sliding members or die holders 1,1. One of these die halves is equipped with an ejector pin 8 under the impression and this pin is permanently fastened to an ejector plate 9. As the sliding members I, I move away from the injection end of the machine they attain a final position as illustrated in Figure 3. Shortly after the beginning of the stroke, angular travel of the die holder has caused the ejector plate to strike the fixed member H) (see Fig. 3 and Fig. 4). As the die continues on its stroke the fixed member It! causes the ejector plate to remain in a parallel position to the center line of the machine whereas the die continues to move away from the center line of the machine. This in efiect pushes the solidified object I I from the mold and suspends this object at the tips of the ejector pins. Just before reaching the end of its stroke the solidified object I l comes in contact with the fixed knockout member I2. This contact removes the casting from the tip of the ejector pin and it drops below the machine.

I am aware that prior to my invention casting machines have been made with die carriages that contain automatic ejecting mechanisms, i. e., mechanisms which cause the ejection of the casting during the stroke of the machine. I therefore do not claim automatic ejection in its broad sense, but I claim:

A pressure casting machine comprising a pair of converging guides, complemental separable die sections slidable in said guides and each having a mold cavity, means for moving said die sections longitudinally relatively to said guide members to actuate said die sections toward and from each other for closing and opening the mold respectively, an ejector pin longitudinally slidably mounted in one of said die sections, to which pin the casting in the mold becomes attached during the molding operation, a fixed member which the end of said ejector pin slidingly abuts as the die sections are moved relatively to said guides for causing relative movement of said ejector pin and the corresponding die section upon opening of the mold such that the casting is moved out of said die section in suspension on said ejector pin, and a knockout member to be engaged by said casting as said die sections are moved on said guide members, whereby such casting automatically will be knocked from said ejector pin.

J. R. SCHUCHARDT. 

